Cutter-bar.



Patanted Dec. 3|, I901. i

No. 690,25l.

J. J. ELLSWURTH.

CUTTER an; 7 Application fllad Nov. 8, 19 00;)

(In Modal.)

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WITNESSES: INVENTOR. yr 44 z yw w Th2 mums versus 00. wummma,WASHINGTON. 0, c4

UNITED STATES PATENT OFFICE.

JOHN J. ELLSlVORTH, OF EAST TAWAS, MICHIGAN.

CUTTER-BAR.

SPECIFICATION forming part of Letters Patent No. 690,251, dated December31, 1901.

Application filed November 8, 1900- Serial No- 35,799. (No model.)

T0 at whom it may concern.-

Be it known that I, JOHN J ELLSWORTH, a citizen of the United States,residing at East Tawas, in the county of Iosco and State of Michigan,have invented certain new and useful Improvements in Cutter-Bars; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to cutter-blades for mowing-machines.

The object is to produce a blade that can be readily attached to thecutter-bar, having means for supporting and guiding the rear part of theblade, and so constructed as to be simple and capable of beingmanufactured economically and at small cost.

My invention is illustrated in the accompanying drawings, throughout theseveral views of which similar characters of reference designatecorresponding parts and devices.

Figure 1 is a top view showing part of a cutter-bar with some of theblades in place. Fig. 2 is a back view of the same. Fig. 3 is aperspective detail of a single cutter-blade. Fig. 4 is an end view ofthe driving-head. Fig, 5 is a sectional view of a blade having arearwardly-projecting lip or flange. Fig. 6 is a perspective detail of ablade with the socket partly formed.

As is clearly shown in the drawings, the device consists in a bar 1, ofsteel or other suitable material, preferably rectangular incrosssection, one end of which is bent upwardly, as shown in Fig. 2, andis provided with a threaded hole to receive a clamping-screw 1, which isprovided with a set-nut 1 The driving-head 2, to which theknife-operating mechanism is attached, is provided with alongitudinalslot 2, permitting the head to slide along the bar 1. Each bladeconsists in the usual beveled knife 3; but instead of being secured tothe bar by bolts or rivets the blade is formed with a slot 3 produced bybonding the rear part of the blade, as shown in Fig. 3, whereby theblade may slide along the bar 1. The full complement of blades fills thebar from the driving-head to the outer end, where a pin 1 is passedtransversely through the bar to hold the blades in position. 4 is arearwardly-projecting lip formed by cutting a U-shaped slit in the backof the v knife and bending up the lip to form a support for the rearedge of the blade. In practice the projecting lip rests upon alongitudinal gnide-barsecured to the knife-supporting frame of themower.

Tightening the screw l rigidly clamps the blades together, at the sametime putting the bar 1 under tension. The set-nut 1 prevents the screw 1from loosening.

By the means above described I have produced a cutter that is strong,having no holes through the blades or bar for rivets or like fasteningdevices. Any blade can be easily and quickly removed or replaced withoutcutting rivets or unscrewing bolts, as is necessary with the commonforms of blade-fastenings. If the bar is injured or broken, the bladescan be readily removed and mounted on a new bar without drilling orfitting holes, and each knife can be detached from the bar and besharpened separately upon an ordinary grindstone, thus avoiding thenecessity of a specialgrinding-machine for dressing the blades on thebar.

What I claim is- A knife for cutter-bars,consisting of a sheetmetal'blade the rear end of which extends back over the cutter-bar; a socketfor receiving the bar, formed by bending the rear part of the bladedownwardly, forward along the under side of the cutter-bar and up to theunder side of the cutter-blade; a rearwardlyprojecting lip formed bycutting a U-shaped slit in the back wall of the socket and bending upthe lip to form a support for the rear edge of the blade, substantiallyas described. In testimony whereof I affix my signature in presence oftwo witnesses.

JOHN J. ELLSWORTH. 4

Witnesses:

E. L. KING, A. E. SHARPE.

